Reservoir-pen.



w. w. SANFORD.

RESERVOIR PEN.

APPLIOATION FILED MAR. 26, 1909.

Patented Nov. 30, 1909.

v a W A, A 5i\\.

, WITNESSES UNITED STATES PATENT OFFICE.

WILLIAM W. SANFORD, OF NEWARK, NEW JERSEY, ASSIGNOR TO SANFORD & BENNETTCOMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

, RESERVOIR-PEN.

Specification of Letters Patent. Patented Nov. 30, 1909.

Application filed March 26, 1909. Serial No. 485,945.

To all whom it may concern:

.Be it known that I, WILLIAM W. SANFORD, a citizen of the United Statesof America, and a resident of the city of Newark, county of Essex,State. of New Jersey, have invented certain new and useful Improvementsin Reservoir-Pens, of which the following is a specification.

This invention relates to improvements in reservoir pens, particularlystylographic pens, and the purpose of the invention is especially toprovide reservoir pens in which the air tube is so formed as toconstitute of itself a spring to insure proper adjustment of the needleand smooth clear Writing,-

while dispensing with the costly platinum springs sometimes used. Myinvention also, besides greatly reducing the cost, overcomes the seriousdisadvantage which attends the use of platinum springs, of the needlesgetting out of alinement and catching and being bent and injured whilere-assembhng the parts after filling the reservoir; for with myinvention the needle is held true and passes through the point withoutcatching.

Referring to the drawings which accompany the specification to aid thedescription, Figure 1 is a longitudinal section and elevation, on alarge scale, of a stylographic pen equipped with the invention. Fig. 2-is a longitudinal section of the air tube on the scale of Fig. 1. Figs.3 and 4 are cross sections respectively on the planes of the linesIIIIII and IVIV of. Fig. 1.

The barrel, or reservoir, A and point section- B may be constructed inthe usual manner, and the end D of said barrel, which may be integralwith the body of the barrel as shown, is preferably chambered as shownand provided with the inwardly projecting air inlet tube d, wherebyleakage of ink, should the pen be carried with'the end D down, isobviated. Said cap C may be provided with a rubber plug 6, bearing onthe point I) when said cap is on the point section.

The air tube E is formed as a spring at the part near to the needle h,and this is preferably effected by cutting .fine spiral slits throughthat part of said tube E, so as to form a spiral thread or threads as f.By such construction, the hard rubber, or other suitable material ofwhich said tube E is made, constitutes an elastic end portion, so thatof itself, and without any other spring, it gives to the needle h a verysmooth motion over the paper when writing, and insures a smooth clearimpression without blotting; andsaid spring also enables the said needleh and the tube or point I), at the extremity of the point Section "B, tobe properly adusted tmach other without difiiculty, said needle hnormally projecting slightly beyond the. rounded end of said point 0.Said needle'h is secured in a plug of hard rubber, g, to about half thelength of the plug, which plug is threaded or otherwise fastened in theend of the air tube E preferably outside of the spring part thereof.

To properly check the air feed to the ink I ,and prevent too rapid flowand leakage of erly fed to the lower end of the said tube E,

and to the barrel A; and I find by actual use with a number of pens,that there are great advantages in choking said air tube E as near aspracticable to the slits 6 between the spirals f.. As indicated in thedrawing, this choking is effected by said plug 9' with its minute bore,which is placed as near as practicable to the said slits c. When the airtube E is thus choked, the result in preventing leakage of ink throughsaid air tube E when the pen is carried with the end D down, is muchbetter than if the plug 7' were placed, or said air tube E were in anyother manner choked, at a part remote from said slits, and it will beunderstood, that if the threads f were not employed, but the air tubewere solid and provided with the usual air hole, then the choke shouldpreferably be near said air hole, and I therefore wish to. cover as animportant part of my-invention an air tube choked adjacent to theorifice by Which-air is admitted to the reservoir or barrel. I 1

In operation, the cap C being removed from the point section B, needleit moves over the paper, the spring formed by said spiral f insures tothe needle a smooth mot1on with clear smooth writing, and the slightlongitudinal movement of said needle promotes uniform continuous feed ofthe ink through thenbore in the end of point section B past the needle hand to the point I). The end of said air tube E remote from the needle hfitting with practically air tight fit in the end of the barrel A,experience with a number of'pens shows that suflicient ink to cause anytrouble can not work through I ore in said tube adjacent to the o eningbethe bore of plug j, and the very little ink tween the coils of saidspiral, su stantiallv that can work through is retained in the asdescribed. I chamber of plug D. Signed at New York city this 25th day of5 I IiTow having eseribed my improvements, March 1909.

e aim as my invention. The combination in a reservoir pen, of WILLIAMSANFORD an air tube provided With a spiral lntegral Witnesses: threadconstituting a, spring, a needle sup- WALTER N. HARRIS, 10 ported bysaid tube, and a plug with minute 1 G. W. HOPKINS.

